Maintenance of Wakefulness Test (MWT)

Before the test, you will receive a sleep diary in which you will mark your sleep and wake times over several days. Try to maintain a regular sleep schedule during the week leading up to the examination. It is important that you sleep normally the night before the test, preferably at least 6 hours. 

To ensure good electrode contact, your hair should be clean and dry. Do not use hair styling products. 

• Patient instructions for examinations

During the test, your task is to remain awake for 40 minutes while sitting still in a reclining chair with your eyes open in a dimly lit room. There are four test sessions during the day (between 8:00 and 15:00), each spaced two hours apart. If you fall asleep during a session, you will be awakened after no more than 1.5 minutes. 

A healthy person typically remains awake for about 30 minutes during the test, but there is considerable variation. About 5% of healthy individuals fall asleep in less than 13 minutes. 

A wakefulness duration of 20 to 33 minutes is considered sufficient for safe driving. For professional driving, a threshold of up to 40 minutes—remaining awake throughout all test sessions—has been recommended. 

The test does not require follow-up and does not impose any restrictions on normal daily activities. 

The physician who referred you for the examination will inform you of the results and the next steps in your treatment. If you do not have a scheduled appointment or call time, please contact your care unit. 

The examination is painless and involves no risks.